Marking instrument



FIG. 1 is a front side, and bottom perspective view of my design for a marking instrument, consisting of a barrel and a cover, with the cover in place on the barrel;

FIG. 2 is a side elevational view thereof from the same side as in FIG. 1 and with the cover in place on the barrel;

FIG. 3 is a front elevational view thereof with the cover in place on the barrel;

FIG. 4 is a rear elevational view thereof with the cover in place on the barrel;

FIG. 5 is a bottom plan view thereof with the cover in place on the barrel;

FIG. 6 is a top plan view thereof with the cover in place on the barrel;

FIG. 7 is a side elevational view thereof with the cover removed; and,

FIG. 8 is an end elevation view thereof corresponding to that in FIG. 6 and with the cover removed.

The end portions of the barrel and cover have been shaded to indicate color contrast. 

The ornamental design for a marking instrument, as shown and described. 